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              canvas { position: absolute; top: 0; left: 0; z-index: -1; }
canvas + canvas { opacity: 0.3; z-index: -2; }

.desc { position: absolute; z-index: 10; left: 0; right: 0; bottom: 0; padding: 1em; font-size: 10px; color: #aaa; text-align: center; }

.loading:before {
  position: absolute;
  top: 0;
  left: 0;
  padding: 1em;
  content: 'Loading...';
  color: #aaa;
  font-family: monospace;
}
            
          
!
            
              console.clear();

let mesh;
let cloth;
let spacingX = 5;
let spacingY = 5;

let opts = {
  image: 'http://brokensquare.com/Code/assets/face.png',
  pointsX: 50, 
  pointsY: 50,
  
  pointCount: 50,
  
  brushSize: 30,
  
  randomImage(){
    this.image = 'https://unsplash.it/400/400?image=' + Math.floor(Math.random() * 1100);
    if ( cloth ) { cloth.randomize(loadTexture); }
    else { loadTexture(); }
  },
  reset(){
    if ( cloth ) { cloth.reset(); }
  },

  randomizePoints(){
    if ( cloth ) { cloth.randomize(); }
  }
};

/*////////////////////////////////////////*/

let gui = new dat.GUI();
gui.closed = window.innerWidth < 600;

let image = gui.add(opts, 'image', { 
  Face: 'http://brokensquare.com/Code/assets/face.png', 
  Logo: 'http://brokensquare.com/Code/assets/logo.svg',
  shshaw: 'http://brokensquare.com/Code/assets/head.svg',
  Lion: 'https://unsplash.it/400/400?image=1074',
  Water: 'https://unsplash.it/400/400?image=1053', 
  YellowCurtain: 'https://unsplash.it/400/400?image=855', 
  Tunnel: 'https://unsplash.it/400/400?image=137'
});
image.onChange(loadTexture);


let pointCount = gui.add(opts, 'pointCount', 20,80).step(1);
pointCount.onFinishChange((val)=>{
  opts.pointsX = opts.pointsY = val;
  loadTexture();
});


/*////////////////////////////////////////*/

let mouse = {
  down: false,
  x: 0,
  y: 0,
  px: 0,
  py: 1
}

let brush = new PIXI.Graphics();
function updateBrush(){
  brush.clear();
  brush.blendMode = PIXI.BLEND_MODES.ADD;
  brush.lineStyle(1, 0x888888, 0.4);
  brush.drawCircle(0, 0, opts.brushSize); // drawCircle(x, y, radius)
  brush.x = mouse.x;
  brush.y = mouse.y;
  brush.updateLocalBounds();
}

updateBrush();

let influence = gui.add(opts, 'brushSize', 0, 100).step(1);
influence.onChange(updateBrush);

let random = gui.add(opts, 'randomImage');
let randomize = gui.add(opts, 'randomizePoints');
let reset = gui.add(opts, 'reset');

/*////////////////////////////////////////*/

let stage = new PIXI.Container();
stage.addChild(brush);

let renderer = PIXI.autoDetectRenderer(window.innerWidth, window.innerHeight, { transparent: true });

document.body.appendChild(renderer.view);
renderer.render(stage);


/*////////////////////////////////////////*/

function loadTexture() {

  console.log('loading texture', opts.image);

  document.body.className = 'loading';

  let texture = new PIXI.Texture.fromImage(opts.image);
  if ( !texture.requiresUpdate ) { texture.update(); }

  texture.on('error', function(){ console.error('AGH!'); });

  texture.on('update',function(){
    document.body.className = '';

    console.log('texture loaded');

    if ( mesh ) { stage.removeChild(mesh); }

    mesh = new PIXI.mesh.Plane( this, opts.pointsX, opts.pointsY);
    mesh.width = this.width;
    mesh.height = this.height;

    mesh.x = renderer.width / 2 - mesh.width / 2;
    mesh.y = renderer.height / 2 - mesh.height / 2;

    spacingX = mesh.width / (opts.pointsX-1);
    spacingY = mesh.height / (opts.pointsY-1);

    cloth = new Cloth(opts.pointsX-1, opts.pointsY-1, !opts.pinCorners);

    stage.addChildAt(mesh,0);
  });
}

loadTexture(opts.image);

/*////////////////////////////////////////*/

;(function update() {
  requestAnimationFrame(update);
  if ( cloth ) { cloth.update(0.016) }
  brush.x = mouse.x;
  brush.y = mouse.y;
  renderer.render(stage);
})(0)

/*////////////////////////////////////////*/


const twoPi = Math.PI * 2;
const ease = Elastic.easeOut.config(1.2, 0.4);

class Point {
  constructor (x, y) {
    this.x = this.origX = x
    this.y = this.origY = y
    
    this.randomize(this.reset.bind(this));
  }

  animateTo(nx, ny, force, callback){

    if ( !this.resetting || force ) {
      let dx = nx - this.x
      let dy = ny - this.y
      let dist = Math.sqrt(dx * dx + dy * dy)
      this.resetting = true;

      TweenMax.to(this, 
        Math.min(1.25, Math.max(0.4, dist / 40) ),
        {
          x: nx,
          y: ny,
          ease: ease,
          onComplete: () => {
            this.resetting = false 
            if ( callback ) { callback(); }
          }
        })
    } else if ( callback ) { callback(); }
  }

  randomize(callback) {
    let nx = this.x + ((Math.random() * 60) - 30);
    let ny = this.y + ((Math.random() * 60) - 30);

    this.animateTo(nx, ny, null, callback ? callback : null );
  }

  reset(){
    this.animateTo(this.origX, this.origY, true);
  }

  update (delta) {

    let dx;
    let dy;

    if (!this.resetting && mouse.down) {      
      dx = this.x - mouse.x + mesh.x
      dy = this.y - mouse.y + mesh.y
      let dist = Math.sqrt(dx * dx + dy * dy)

      if ( dist < opts.brushSize) {
        this.x = this.x + (( mouse.x - mouse.px) * Math.abs( Math.cos( twoPi * dx / dist)))
        this.y = this.y + (( mouse.y - mouse.py) * Math.abs( Math.cos( twoPi * dy / dist)))
      }
    }

    return this
  }


}

/*////////////////////////////////////////*/

let count = 0;

class Cloth {
  constructor (clothX, clothY, free) {
    this.points = []

    let startX = 0; //renderer.view.width / 2 - clothX * spacingX / 2;
    let startY = 0//renderer.view.height * 0.1;

    for (let y = 0; y <= clothY; y++) {
      for (let x = 0; x <= clothX; x++) {
        let point = new Point(startX + x * spacingX, startY + y * spacingY)

        this.points.push(point)
      }
    }

  }

  randomize(callback){
    this.points.forEach((point,i) => {
      point.randomize( i === 0 ? callback : null );
    })
  }


  reset(){
    this.points.forEach((point) => {
      point.reset()
    })
  }

  update (delta) {

    this.points.forEach((point,i) => {
      point.update(delta * delta)

      if ( mesh ) {
        i *= 2;
        mesh.vertices[i] = point.x;
        mesh.vertices[i+1] = point.y;
      }
    });

  }
}

function pointerMove(e) {
  let pointer = e.touches ? e.touches[0] : e;
  mouse.px = mouse.x || pointer.clientX
  mouse.py = mouse.y || pointer.clientY
  mouse.x = pointer.clientX
  mouse.y = pointer.clientY
}

function pointerDown(e){
  mouse.down = true
  mouse.button = 1
  pointerMove(e);
}

function pointerUp(e){
  mouse.down = false;
  mouse.px = null;
  mouse.py = null;
}

renderer.view.addEventListener('mousedown', pointerDown);
renderer.view.addEventListener('touchstart', pointerDown);

document.body.addEventListener('mousemove',pointerMove);
document.body.addEventListener('touchmove', pointerMove);

document.body.addEventListener('mouseup', pointerUp);
document.body.addEventListener('touchend', pointerUp);
document.body.addEventListener('mouseleave', pointerUp);

            
          
!
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